One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,5)(6,8)(9,10)(11,17)(12,14)(13,16)(15,19)(18,24)(20,22)(21,23) involution — undirected(2,5)(6,7)(9,11)(10,15)(12,17)(13,21)(14,19)(16,24)(18,22)(20,23)(25,26,31,29)(27,34,28,32)(30,33,38,37)(35,40,36,39)(1,2)(3,6)(4,5)(7,8)(10,12)(15,17)(16,20)(23,24)(25,27,31,28)(26,32,29,34)(30,35,38,36)(33,39,37,40)(1,3)(2,6)(4,8)(5,7)(9,12,14,10)(11,17,19,15)(13,16,22,20)(18,23,21,24)(25,28,31,27)(26,32,29,34)(30,36,38,35)(33,39,37,40)(9,13)(10,16)(11,18)(12,20)(14,22)(15,23)(17,24)(19,21)(25,29,31,26)(27,34,28,32)(30,33,38,37)(35,39,36,40)(9,11)(10,15)(12,17)(13,21)(14,19)(16,24)(18,22)(20,23)(25,30)(26,33)(27,35)(28,36)(29,37)(31,38)(32,39)(34,40) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.